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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc00c353777cbc60e145fcecde6b7acce927dbae8e1c16ee45dffc46c83793d' 
  AND token = 'EOTmuJd3iLv+enjPGrAAt1br4LZhtY/mTXyleLi+Nw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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