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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2617c1157f4010f4e5842b42af068ba8bfb463057e1ee139917bdd26034c1c4' 
  AND token = 'OVqLyj4YoW9aKPmSueYtgBU10ZRCt8anCm1htd22WkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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