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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7b2190f1047257438918ecbd5dfaa7033bca6712968c7f611ca60d8c9bb55e' 
  AND token = '3srxv3WTFsRLvbOSfvjjjMWK/K+05p+TQn13n9k7tUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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