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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91159de5097d990ef7ce838d0698b50d46638719bd612a46776038a8a5182de' 
  AND token = 'X2NpfkhwF4CEOnGUfASNQRchq9maONhGEdHeoyvGYH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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