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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162f37d5f91cfd4a4ef8da93ecedbf53bdfd695cd76fd8be57ad4406efffb12d' 
  AND token = '+gt+mYmLL8QeTPy+O0+7YT4p0kPQgjTJiqzvJTgRWE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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