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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a8060841b585889df95f35e75fece2354273bba7a5ef9b15074e1a9ea80edd' 
  AND token = 'ywh3QF7bz3Dv1ezvgJUEb02AdvRiJGJ9US05LwwFVi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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