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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a939a2c73f152e72585809b11d1ebe3a9f2cbae36b048b16ff678197c303aab' 
  AND token = 'oaEid2iwAC2be3QF1OfJLKiM+/mP6TzE6y35vRuYLgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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