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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18a1805f0023ce4dbf1fe88e94a104e4f01b5ce194b450d5baebae1f1468dcf0' 
  AND token = '5xtPStyrB+VMzhVMOChQSZKmQG5n/FR9ffenmeHb7lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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