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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c380b4d684a89f18ddc032e9c691370cc265e142e9c2cc2ba6e9a118e34600' 
  AND token = 'kCFSWZ8SlUr8FFaLfpBmoAQz1N85/gPKuam800P5P3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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