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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1398e39e10570f0aa3d82c1c6d5ed27255c763739dc578000a828c5bf3b1ab2' 
  AND token = 'n+3sYu62ZqYDw54iiAC9HwGXSp7AuzY3TDJvzdWQHeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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