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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7c81ae4144d81e16481a384ef1b34727340c4ba19b0b6e5c75556d4e0c4270' 
  AND token = '2Cso2Mr03CWznaYlWx4Fb4sUcKiArjXne0WlEeQnky8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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