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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4c591c8c9fec39f886a94fef9660dbe7409bbb4a1ea87fc27afd1ac5510297' 
  AND token = 'NJfiwGxCBkyI3C8iNfZPcFGybnGN4Nji8yaEmv2n0yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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