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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da0823de5cac96bb9d4342297425d6d4585956a7194171d54a6f72c1d1bbc4d' 
  AND token = 'sNq9b2RndBYu7+CdvWaNCwca42WZKB6BQLlccoiAY+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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