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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b3876c4357c173561a2b4480f5f5a25d0da0f77d67049db0dea2272d3c3b33' 
  AND token = '/ngqVlOEusbLpzWUIOv0CrAzLb3rdYft+uZnrpCW/4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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