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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545204d440dd2ceb48588ac2edb6154c1573caef7924e0ab1ed0350c8a0907e9' 
  AND token = 'ud469epG1H5YTpxJtQi8/K4f3N6TFWlYSB3Rwf6JfKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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