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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591de25e2d709d3ad490bdae23a32f92b4ad513b520787288fd5d767657c5c2c' 
  AND token = 'n5E9RGm0TRPgqTiudkLoNzdGfPZLXg4G81TiCwVhW2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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