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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2889b0d2c911080688bee63f3cb65565418683d8098e100cb1f17fb3c1113d36' 
  AND token = 'C6DAj1rsSIv67IeoqxN3hS4WPF6G7iHSDNHvWs9lfVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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