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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c37f7e1b5c30231c6c666ca571126d17dbbbe7de3dfd3e11aeae2a51f671ff' 
  AND token = 'bZkG72S+TedPAx9oC8iyBKhPmiMu3iYkj72Ejbpp0UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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