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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3228cad4a7d3801423ee15489025da5cf41e299cf005f3f89a6e75a70e297cdb' 
  AND token = 'uTVy36qUirXWZv4AMxfNJHKNDN7WDvV+MeNc2Qa6ttw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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