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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc79453a92755db7f1707763bb29a7444ea254ebd4ac28b502371928ce58477' 
  AND token = '+cOGQ7n77BsN2j/i7N6j3TCClUn7EK/1GCKc/yUeZm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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