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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1530ade67dba399a1967e2c341867887270a9f6b2f432cea50fb69fd75a8a496' 
  AND token = 'eyqo+8ByEPxor7RJUy78ng27/zlkvXlCH+U6NCH6TWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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