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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c690aca5e5a1b52a8087266b2f7c73f8e628ba9477f89b654a2d576cbcd081' 
  AND token = '2m8yTEKNfve7mmbSDOvKUHR5gwPjhiShTc34qKMJpHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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