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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c9427285950e443f090937b0a0de2fddc2478a04b5523d1451162479d1f285' 
  AND token = 'mehpar0Praz0cWoHks9RhK9aeH4h+tC0iPTouB43Y8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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