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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8eb657ae5c87b813528393a4209aa5fd888c2b87649dead057a2a6b6ce05b65' 
  AND token = '3nxckayQsU7FRV2klwKsA3NT++1zKRLvsuNxCV+6KL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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