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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d9b2d4dde68e5925a5cce86d9191c5e81cf440b697f7594d3342c240a830d8' 
  AND token = 'MHV5eVlXOu5bij70MET3fo5z9H/PmHm8NPi2HEgON5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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