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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f11c41d849348a77242fc2eec621766dd728bdae5507465676642ab1c455f6' 
  AND token = 'mQHlO8eHAjTRnR0Y8PzJ3kj0it9jeetz1nfybiPsAOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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