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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a795588c1c0080025f0411b2d6035515d4050ad8887f96fe7aff7ff31b515a3a' 
  AND token = '8XIW82vvthOuAcKy85/ulT0r9CM6iupIKQpIWlNkWXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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