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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea057a74fd8ddc7291f47479ad397ff7bb0631ebbede17a01f888d1a6b565e99' 
  AND token = 'eDvssaS0r4EY5AC6v1/dsOyR48v84/KR888/n/LMQuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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