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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511bd38b76bd4e7be0d6ce7560246a4da356f40826b49fe193fd20c80e17242a' 
  AND token = '/Y011/tLAzWDySGPmKxeRC1wbnxqMJ46Vmtr7bNnI3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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