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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd604ca01ef67836840670e3e3953e819fb78a2d46277f97c1927f95e4abbc5b5' 
  AND token = 'LAqMhIq5+hXd0JMcs+80CkEh+/nAtY3qBorjJplEE1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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