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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ea802e5b61fd2be456ef4be6d3e7a0ca17184ce9c7e5faa4b85acdf4ed6979' 
  AND token = 'O+UcRiIgRjW02eP277Gd2bnCRad6ejY/t+NSEkAHu5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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