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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c25774c2ea28b269f3e55e7077374b2c0b19242843c56746ad2606e13707ba' 
  AND token = 'XnuyL+lNF5IuzAnIa2QJlYBscDBkNHCto+Bj3ZuyL4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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