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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff3c5d769a85d930c5cab1049cc0ba65b5afa927b122b4dad34f92d189c8b8b' 
  AND token = 'JA6k6d6SMMMd4oQ9QP9au1HDJU2U/ztFX2Cpaxh8Tyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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