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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8706c78c3cb0fbf7f948b49f9771a6b8e4762eb77a009623ad2a8dfdfd9c17c2' 
  AND token = 'Rh402hbnE9kPqylKZJikw5f6jcwE1vosgkpayH1pcpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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