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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b54716ecf12216e2f4e9eda8712acd3be0028ef2f1b9921602ed45b32ac8a6' 
  AND token = 'NKDv1co6nUgrj0XDnKcbnTjbPNmYY/UAof9+wqmo1IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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