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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2170ab2b6193695b1c32a4ff106b67755c775d8013712dad99c7be8a7b7fd2cb' 
  AND token = 'zyjnJuGR6n1pTXcA6q8aanuqd16YUT4haZzfn8/mUgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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