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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5576d722f876af029afcba6da28d7b50f1502d03d012e0872fcb7dfa4ebad4f5' 
  AND token = 'uL1idqjkXDV9/iDm+stIjRTQjTOtPBIPAj19cmL0pxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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