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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b64e3e30292d686727eac61a49f6942e2cda746296941494c08ab63360865f2' 
  AND token = '+B4dBud9uqftsoyQCEL4OxNazlHd0nz+Aay2yVcqz+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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