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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5cc1b876760808e23620b3f086f002c1a05ea7f698bf1ee38eb4f7eb771a918' 
  AND token = 'uOVehWrnz/eRHXf9WLyrodJJYspT+90gCdC8K+3p6NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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