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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1dabc3e38a6a44681c205a22d3c565e9a8b17f6db3bce10dbdb3a9edb66263' 
  AND token = 'lu7ZkRmG60iJTxqfNAF1uEerm+3Ef2+pFyx4r4rZQCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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