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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27cc36b718db7676d67c7dee01fe15953f87db50e1a3f6628adf56cc8afdfe1' 
  AND token = '3bucvkwISsDUk4XDCyU/Z5FgRry/gLiTN7B+q84+dWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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