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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505fe4eb571c941b5a948c721c6324d908c71c0a1d399c09b1cbca34659ec241' 
  AND token = 'GFhfNAsQiUY99q3L/DavuKnZjLU8Dp3WmGgf7lciYcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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