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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaedea047cb74d2296072e561e7e98c187d0c0264fd2e8195de3685be48f7b7d' 
  AND token = 'WRF87OvS2UDLc9+ub4ts66uiUIGTqP4d44XPQUoxJgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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