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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1ec2b1ea809c06b156495fb73e4d11ef05036b6e252abfbe729749d87933d2' 
  AND token = '/hxB1SGTsYI5vWw4ys25bHOexnHzvj9jX2g8dsgnymE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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