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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380f9b0e5d51cd4515ba8792e084cd3cdb0c8e0fc8285fb1a0e4207e990beda7' 
  AND token = 'dRxd6VOYlhKf3Y30MOoRd8tybqy11aCAgzLRvO+4lFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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