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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1eb129cece72c2127dfa1af6dacfa7bcd2c42e14d6bb57a803a4473887b06dc' 
  AND token = 'ThWUDBUJI5mDMVs09dPK/n9wAe8juICtcyYDcSMlikU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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