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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e9ed01e69f4a82082a7681ebbbf5ae7831453615414559b7ad1e85b2f3f503' 
  AND token = 'CpLT8m23Lpnw+MRbVSxg90s00whN3VThc1/LmEE7bJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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