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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f049c0b908813379aaf76adaff72908857ce6a5bad35067838d10708ab25d1' 
  AND token = 'cABHpeowR9IOuqSTJD37t0lKx4UedFamXGjO+tKBnGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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