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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725fafc228cd9f63707c0f7ef5658bce33b3e37caed4feb161cad04b3dc39638' 
  AND token = 'v97i22sVKOm5EKFvdxrrxsz8NPFNQ5oS2A1RwcxukZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}