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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f2a934116e46cf12cf25ee02722e4f63246bdae39a4b89c71ff5efb97d18932' 
  AND token = 'kWkmb8TRdT8NEBWI9mIlD533x6ZYq/XF1VhZZHSITuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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