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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea8723b99e3ee2002c6b295c5db003f19715012f157b6a3d74327a7b970396cd' 
  AND token = '/DNEuT1HJdUFrNBPT0gAjpo95vq2HwOyN91ylkUArdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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