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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc6e998d5ca0dfcb6fa53feb1f4194de55303f70c3088e40f1f768524ee2262' 
  AND token = '8v6v2QSKLscFa1A8ZkgqaTt7dFMfkVAagMQuVwY9x78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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