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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976b302e1397f57cfa3b9dcce4bdb20efc789d663e5b71a28c2e73e63abbda03' 
  AND token = 'GcDgaCZ6ae72MQwLmcrnGo4ZU9WDinpGCK5abml6aCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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