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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bf1d98ae3fab6773846444fe5a358b6b2a078680eda80898347f8722c1e414' 
  AND token = 'NxsC4J75lmf9J/3mO23PCvwSqR6ecLjCmCwt5s5mo3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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