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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b9b7b954aaebd8a7a5da405b91323a7e20b9fef7b977fb2d74c66e352b966c3' 
  AND token = 'CQhPcntYvIjd7HUEQqOa7dGFzIWR1vbOFvSULgM9jMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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